electrical problems from nowhere
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electrical problems from nowhere
So I believe I have a short...
it's a '77 F-100 Stepside with a 3 speed cruise-o-matic tranny powered by a 5.0L 302C.I. V8 (2 Barrel Edelbrock Carb)
All of my rear lights and turn signals worked fine... untill out of nowhere they changed to this...
When in Park, no rear lights work (including break, running) AND if you put one blinker on, they both light up...
When in reverse.... Brake lights work... running lamps do not, turn signals do work.
When in drive... Not a damn thing.
Also, when the rear lights/turn signals work, the running lights up front become very dim....
They have worked for the last x amount of years.... At the same time, the "Brake" light on the dash wont even illuminate when you go to start it... which it should.
So i take it that it's a short? Any idea where to start? I searched every wire and everything is hooked up. Nothing was severed. Never had this issue prior.... HELP!
it's a '77 F-100 Stepside with a 3 speed cruise-o-matic tranny powered by a 5.0L 302C.I. V8 (2 Barrel Edelbrock Carb)
All of my rear lights and turn signals worked fine... untill out of nowhere they changed to this...
When in Park, no rear lights work (including break, running) AND if you put one blinker on, they both light up...
When in reverse.... Brake lights work... running lamps do not, turn signals do work.
When in drive... Not a damn thing.
Also, when the rear lights/turn signals work, the running lights up front become very dim....
They have worked for the last x amount of years.... At the same time, the "Brake" light on the dash wont even illuminate when you go to start it... which it should.
So i take it that it's a short? Any idea where to start? I searched every wire and everything is hooked up. Nothing was severed. Never had this issue prior.... HELP!
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
Originally Posted by '77Stepside
All of my rear lights and turn signals worked fine... untill out of nowhere they changed to this...
When in Park, no rear lights work (including break, running) AND if you put one blinker on, they both light up...
When in reverse.... Brake lights work... running lamps do not, turn signals do work.
When in drive... Not a damn thing.
Also, when the rear lights/turn signals work, the running lights up front become very dim....
When in Park, no rear lights work (including break, running) AND if you put one blinker on, they both light up...
When in reverse.... Brake lights work... running lamps do not, turn signals do work.
When in drive... Not a damn thing.
Also, when the rear lights/turn signals work, the running lights up front become very dim....
My bet is on the chaffed harness resulting in a short or shorts and some sharing of grounds. Also, check closely where wiring runs through steel like firewall rubbers, etc .... (and check the harness in the steering harness where it exits or is held in place by a metal clip / clamp).
The headlights growing dimm when the rear lights do work sounds like a short draining some of the available juice to ground. The headlights also have no roots in the steering column or signal switch but a short elsewhere would still affect them. These trucks have maybe 60-63 amp alternators when new.
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